A researcher investigated whether a group of participants who completed a 20-minute daily high-intensity interval training (HIIT) session for three weeks would show higher blood plasma concentrations of beta-endorphins (measured in pg/mL) compared to a control group who engaged in no daily exercise.
Write a directional alternative hypothesis for this investigation.
6 exam-style questions on OCR A Level Psychology Exercise and mental health (Biological). Each one has a worked solution and a mark scheme showing where the marks go.